1. 02 Mar, 2011 1 commit
    • Gerrit Renker's avatar
      dccp: fix oops on Reset after close · 720dc34b
      Gerrit Renker authored
      This fixes a bug in the order of dccp_rcv_state_process() that still permitted
      reception even after closing the socket. A Reset after close thus causes a NULL
      pointer dereference by not preventing operations on an already torn-down socket.
      
       dccp_v4_do_rcv() 
      	|
      	| state other than OPEN
      	v
       dccp_rcv_state_process()
      	|
      	| DCCP_PKT_RESET
      	v
       dccp_rcv_reset()
      	|
      	v
       dccp_time_wait()
      
       WARNING: at net/ipv4/inet_timewait_sock.c:141 __inet_twsk_hashdance+0x48/0x128()
       Modules linked in: arc4 ecb carl9170 rt2870sta(C) mac80211 r8712u(C) crc_ccitt ah
       [<c0038850>] (unwind_backtrace+0x0/0xec) from [<c0055364>] (warn_slowpath_common)
       [<c0055364>] (warn_slowpath_common+0x4c/0x64) from [<c0055398>] (warn_slowpath_n)
       [<c0055398>] (warn_slowpath_null+0x1c/0x24) from [<c02b72d0>] (__inet_twsk_hashd)
       [<c02b72d0>] (__inet_twsk_hashdance+0x48/0x128) from [<c031caa0>] (dccp_time_wai)
       [<c031caa0>] (dccp_time_wait+0x40/0xc8) from [<c031c15c>] (dccp_rcv_state_proces)
       [<c031c15c>] (dccp_rcv_state_process+0x120/0x538) from [<c032609c>] (dccp_v4_do_)
       [<c032609c>] (dccp_v4_do_rcv+0x11c/0x14c) from [<c0286594>] (release_sock+0xac/0)
       [<c0286594>] (release_sock+0xac/0x110) from [<c031fd34>] (dccp_close+0x28c/0x380)
       [<c031fd34>] (dccp_close+0x28c/0x380) from [<c02d9a78>] (inet_release+0x64/0x70)
      
      The fix is by testing the socket state first. Receiving a packet in Closed state
      now also produces the required "No connection" Reset reply of RFC 4340, 8.3.1.
      Reported-and-tested-by: default avatarJohan Hovold <jhovold@gmail.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarGerrit Renker <gerrit@erg.abdn.ac.uk>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      720dc34b
  2. 01 Mar, 2011 1 commit
  3. 28 Feb, 2011 21 commits
  4. 27 Feb, 2011 1 commit
  5. 25 Feb, 2011 7 commits
  6. 23 Feb, 2011 8 commits
  7. 22 Feb, 2011 1 commit